High resolution mass spectrometric studies of some bicyclic γ‐lactones

Abstract

AbstractThe mass spectra of three bicyclic γ‐lactones have been studied, and the fragmentation pathways have been proposed with the aid of accurate mass measurements and metastable transitions. An unusually low [M  CH3] ion and the presence of an abundant [M  C5H9] ion in the mass spectrum of dihydroactinidiolide were interpreted as a possible rearrangement involving a methyl migration. The eliminations of methyl radical, carbon monoxide and ketene are important processes in many cases.